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-rw-r--r--dom/workers/Worker.cpp222
1 files changed, 222 insertions, 0 deletions
diff --git a/dom/workers/Worker.cpp b/dom/workers/Worker.cpp
new file mode 100644
index 0000000000..2348572e65
--- /dev/null
+++ b/dom/workers/Worker.cpp
@@ -0,0 +1,222 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Worker.h"
+
+#include "MessageEventRunnable.h"
+#include "mozilla/dom/WorkerBinding.h"
+#include "mozilla/ProfilerLabels.h"
+#include "mozilla/ProfilerMarkers.h"
+#include "mozilla/Unused.h"
+#include "nsContentUtils.h"
+#include "nsGlobalWindowInner.h"
+#include "WorkerPrivate.h"
+#include "EventWithOptionsRunnable.h"
+#include "js/RootingAPI.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "nsISupports.h"
+#include "nsDebug.h"
+#include "mozilla/dom/WorkerStatus.h"
+#include "mozilla/RefPtr.h"
+
+#ifdef XP_WIN
+# undef PostMessage
+#endif
+
+namespace mozilla::dom {
+
+/* static */
+already_AddRefed<Worker> Worker::Constructor(const GlobalObject& aGlobal,
+ const nsAString& aScriptURL,
+ const WorkerOptions& aOptions,
+ ErrorResult& aRv) {
+ JSContext* cx = aGlobal.Context();
+
+ nsCOMPtr<nsIGlobalObject> globalObject =
+ do_QueryInterface(aGlobal.GetAsSupports());
+
+ if (globalObject->GetAsInnerWindow() &&
+ !globalObject->GetAsInnerWindow()->IsCurrentInnerWindow()) {
+ aRv.ThrowInvalidStateError(
+ "Cannot create worker for a going to be discarded document");
+ return nullptr;
+ }
+
+ RefPtr<WorkerPrivate> workerPrivate = WorkerPrivate::Constructor(
+ cx, aScriptURL, false /* aIsChromeWorker */, WorkerKindDedicated,
+ aOptions.mCredentials, aOptions.mType, aOptions.mName, VoidCString(),
+ nullptr /*aLoadInfo */, aRv);
+ if (NS_WARN_IF(aRv.Failed())) {
+ return nullptr;
+ }
+
+ RefPtr<Worker> worker = new Worker(globalObject, workerPrivate.forget());
+ return worker.forget();
+}
+
+Worker::Worker(nsIGlobalObject* aGlobalObject,
+ already_AddRefed<WorkerPrivate> aWorkerPrivate)
+ : DOMEventTargetHelper(aGlobalObject),
+ mWorkerPrivate(std::move(aWorkerPrivate)) {
+ MOZ_ASSERT(mWorkerPrivate);
+ mWorkerPrivate->SetParentEventTargetRef(this);
+}
+
+Worker::~Worker() { Terminate(); }
+
+JSObject* Worker::WrapObject(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) {
+ JS::Rooted<JSObject*> wrapper(aCx,
+ Worker_Binding::Wrap(aCx, this, aGivenProto));
+ if (wrapper) {
+ // Most DOM objects don't assume they have a reflector. If they don't have
+ // one and need one, they create it. But in workers code, we assume that the
+ // reflector is always present. In order to guarantee that it's always
+ // present, we have to preserve it. Otherwise the GC will happily collect it
+ // as needed.
+ MOZ_ALWAYS_TRUE(TryPreserveWrapper(wrapper));
+ }
+
+ return wrapper;
+}
+
+void Worker::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+ const Sequence<JSObject*>& aTransferable,
+ ErrorResult& aRv) {
+ NS_ASSERT_OWNINGTHREAD(Worker);
+
+ if (!mWorkerPrivate || mWorkerPrivate->ParentStatusProtected() > Running) {
+ return;
+ }
+ RefPtr<WorkerPrivate> workerPrivate = mWorkerPrivate;
+ Unused << workerPrivate;
+
+ JS::Rooted<JS::Value> transferable(aCx, JS::UndefinedValue());
+
+ aRv = nsContentUtils::CreateJSValueFromSequenceOfObject(aCx, aTransferable,
+ &transferable);
+ if (NS_WARN_IF(aRv.Failed())) {
+ return;
+ }
+
+ NS_ConvertUTF16toUTF8 nameOrScriptURL(
+ mWorkerPrivate->WorkerName().IsEmpty()
+ ? Substring(
+ mWorkerPrivate->ScriptURL(), 0,
+ std::min(size_t(1024), mWorkerPrivate->ScriptURL().Length()))
+ : Substring(
+ mWorkerPrivate->WorkerName(), 0,
+ std::min(size_t(1024), mWorkerPrivate->WorkerName().Length())));
+ AUTO_PROFILER_MARKER_TEXT("Worker.postMessage", DOM, {}, nameOrScriptURL);
+ uint32_t flags = uint32_t(js::ProfilingStackFrame::Flags::RELEVANT_FOR_JS);
+ if (mWorkerPrivate->IsChromeWorker()) {
+ flags |= uint32_t(js::ProfilingStackFrame::Flags::NONSENSITIVE);
+ }
+ mozilla::AutoProfilerLabel PROFILER_RAII(
+ "Worker.postMessage", nameOrScriptURL.get(),
+ JS::ProfilingCategoryPair::DOM, flags);
+
+ RefPtr<MessageEventRunnable> runnable =
+ new MessageEventRunnable(mWorkerPrivate, WorkerRunnable::WorkerThread);
+
+ JS::CloneDataPolicy clonePolicy;
+ // DedicatedWorkers are always part of the same agent cluster.
+ clonePolicy.allowIntraClusterClonableSharedObjects();
+
+ if (NS_IsMainThread()) {
+ nsGlobalWindowInner* win = nsContentUtils::IncumbentInnerWindow();
+ if (win && win->IsSharedMemoryAllowed()) {
+ clonePolicy.allowSharedMemoryObjects();
+ }
+ } else {
+ WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
+ if (worker && worker->IsSharedMemoryAllowed()) {
+ clonePolicy.allowSharedMemoryObjects();
+ }
+ }
+
+ runnable->Write(aCx, aMessage, transferable, clonePolicy, aRv);
+
+ if (!mWorkerPrivate || mWorkerPrivate->ParentStatusProtected() > Running) {
+ return;
+ }
+
+ if (NS_WARN_IF(aRv.Failed())) {
+ return;
+ }
+
+ // The worker could have closed between the time we entered this function and
+ // checked ParentStatusProtected and now, which could cause the dispatch to
+ // fail.
+ Unused << NS_WARN_IF(!runnable->Dispatch());
+}
+
+void Worker::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+ const StructuredSerializeOptions& aOptions,
+ ErrorResult& aRv) {
+ PostMessage(aCx, aMessage, aOptions.mTransfer, aRv);
+}
+
+void Worker::PostEventWithOptions(JSContext* aCx,
+ JS::Handle<JS::Value> aOptions,
+ const Sequence<JSObject*>& aTransferable,
+ EventWithOptionsRunnable* aRunnable,
+ ErrorResult& aRv) {
+ NS_ASSERT_OWNINGTHREAD(Worker);
+
+ if (NS_WARN_IF(!mWorkerPrivate ||
+ mWorkerPrivate->ParentStatusProtected() > Running)) {
+ return;
+ }
+ RefPtr<WorkerPrivate> workerPrivate = mWorkerPrivate;
+ Unused << workerPrivate;
+
+ aRunnable->InitOptions(aCx, aOptions, aTransferable, aRv);
+
+ if (NS_WARN_IF(!mWorkerPrivate ||
+ mWorkerPrivate->ParentStatusProtected() > Running)) {
+ return;
+ }
+
+ if (NS_WARN_IF(aRv.Failed())) {
+ return;
+ }
+
+ Unused << NS_WARN_IF(!aRunnable->Dispatch());
+}
+
+void Worker::Terminate() {
+ NS_ASSERT_OWNINGTHREAD(Worker);
+
+ if (mWorkerPrivate) {
+ mWorkerPrivate->Cancel();
+ mWorkerPrivate = nullptr;
+ }
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(Worker)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(Worker, DOMEventTargetHelper)
+ if (tmp->mWorkerPrivate) {
+ tmp->mWorkerPrivate->Traverse(cb);
+ }
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(Worker, DOMEventTargetHelper)
+ tmp->Terminate();
+ NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_PTR
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(Worker, DOMEventTargetHelper)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Worker)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+NS_IMPL_ADDREF_INHERITED(Worker, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(Worker, DOMEventTargetHelper)
+
+} // namespace mozilla::dom